<template>
  <div class="login_container">
    <el-row>
      <el-col :span="12" :xs="0"></el-col>
      <el-col :span="12" :xs="24">
        <el-form
          class="login_form"
          :model="loginForm"
          :rules="rules"
          ref="loginFormRef"
        >
          <h1>Hello</h1>
          <h2>欢迎来到{{ layoutSettingStore.title }}</h2>
          <el-form-item prop="username">
            <el-input
              :prefix-icon="User"
              v-model="loginForm.username"
            ></el-input>
          </el-form-item>
          <el-form-item prop="password">
            <el-input
              type="password"
              :prefix-icon="Lock"
              v-model="loginForm.password"
              show-password
            ></el-input>
          </el-form-item>

          <!-- 使用Flex布局将验证码输入和显示区域放在同一行 -->
          <el-form-item prop="cache">
            <el-input
              v-model="loginForm.cache"
              placeholder="验证码"
              style="width: 63%"
            >
              <svg-icon
                slot="prefix"
                icon-class="validCode"
                class="el-input__icon input-icon"
              />
            </el-input>
            <img
              style="width: 30%; margin-left: 6%"
              :src="captchaImageUrl"
              class="login-code-img"
              @click="refreshCaptcha"
            />
          </el-form-item>

          <el-form-item>
            <el-button
              :loading="loading"
              class="login_btn"
              type="primary"
              size="default"
              @click="login"
            >
              登录
            </el-button>
          </el-form-item>
        </el-form>
      </el-col>
    </el-row>
  </div>
</template>

<script setup lang="ts">
import { reqGetCaptcha } from '@/api/user'
import { v4 as uuidv4 } from 'uuid' // 导入uuid库
import { User, Lock } from '@element-plus/icons-vue'
import { reactive, onMounted, ref } from 'vue'
import { ElNotification } from 'element-plus'
import { useRouter, useRoute } from 'vue-router'
import useLayOutSettingStore from '@/store/modules/setting'
let layoutSettingStore = useLayOutSettingStore()
//引入获取当前时间的函数
import { getTime } from '@/utils/time'
//引入用户相关的store
import { useUserStore } from '@/store/modules/user'
import { loginFormData } from '@/api/user/type.ts'

let useStore = useUserStore()
//获取路由器
let $router = useRouter()
//路由对象
let $route = useRoute()
//利用js生成uuid,声明并赋值
const uuid = uuidv4()
// 声明一个 ref 来存储验证码图片的 URL
const captchaImageUrl = ref('')

// 函数用于刷新验证码图片
const refreshCaptcha = async () => {
  try {
    const response = await reqGetCaptcha(uuid)
    captchaImageUrl.value = window.URL.createObjectURL(response)
  } catch (error) {
    ElNotification({
      type: 'error',
      message: '验证码发生错误' + (error as Error).message,
    })
  }
}

onMounted(() => {
  refreshCaptcha()
})

//获取el-form组件
let loginFormRef = ref()
//定义变量控制按钮加载效果
let loading = ref(false)
//收集账号与密码数据
let loginForm = reactive({
  username: 'admin',
  password: '123456',
  cache: '',
  uuid: '',
})
const login = async () => {
  //保证全部表单相校验通过再发请求
  loginForm.uuid = uuid
  await loginFormRef.value.validate()
  //加载效果:开始加载
  loading.value = true
  try {
    //保证登录成功
    await useStore.userLogin(loginForm as loginFormData)
    //编程式导航跳转到展示数据首页
    //判断登录的时候,路由路径当中是否有query参数，如果有就往query参数挑战，没有跳转到首页
    let redirect: any = $route.query.redirect
    $router.push({ path: redirect || '/' })
    //登录成功提示信息
    ElNotification({
      type: 'success',
      message: '欢迎回来',
      title: `HI,${getTime()}好`,
    })
    //登录成功加载效果也消失
    loading.value = false
  } catch (error) {
    //登录失败加载效果消息
    loading.value = false
    //登录失败的提示信息
    ElNotification({
      type: 'error',
      message: (error as Error).message,
    })
  }
}

//定义表单校验需要配置对象
const rules = {
  username: [
    {
      required: true,
      min: 5,
      max: 10,
      message: '账号长度至少5位',
      trigger: 'change',
    },
  ],
  password: [
    {
      required: true,
      min: 6,
      max: 15,
      message: '密码长度至少6位',
      trigger: 'change',
    },
  ],
  cache: [
    {
      required: true,
      min: 5,
      max: 5,
      message: '验证码长度为5位',
      trigger: 'change',
    },
  ],
}

//当用户按下回车键执行登录方法
window.onkeydown = (e) => {
  if (e.key === 'Enter') {
    login()
  }
}
</script>

<style lang="scss" scoped>
.login_container {
  width: 100%;
  height: 100vh;
  background: url('@/assets/images/background.jpg') no-repeat;
  background-size: cover;

  .login_form {
    position: relative;
    width: 80%;
    top: 30vh;
    background: url('@/assets/images/login_form.png') no-repeat;
    background-size: cover;
    padding: 40px;

    h1 {
      color: white;
      font-size: 40px;
    }

    h2 {
      color: white;
      font-size: 20px;
      margin: 20px 0px;
    }

    .login_btn {
      width: 100%;
    }
  }
}
</style>
